CN107677717A - A kind of outer corrosion testing device of submarine pipeline and detection method - Google Patents
A kind of outer corrosion testing device of submarine pipeline and detection method Download PDFInfo
- Publication number
- CN107677717A CN107677717A CN201710726009.4A CN201710726009A CN107677717A CN 107677717 A CN107677717 A CN 107677717A CN 201710726009 A CN201710726009 A CN 201710726009A CN 107677717 A CN107677717 A CN 107677717A
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- signal
- pressure difference
- submarine pipeline
- control terminal
- platinum electrode
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/416—Systems
Abstract
The present invention is to provide corrosion testing device and detection method outside a kind of submarine pipeline.By to the distribution of submarine pipeline surface current density and the analysis of surrounding environment Electric Field Distribution feature under cathodic protection; in the damage testing for the transportation pipe pipeline external anticorrosive coating that voltage difference method is applied under marine environment, and complete the design of system hardware and software section.Hardware aspect realizes the high speed acquisition to signal using data collecting card as core devices, have chosen suitable electrochemical signals measuring probe, devises signal amplification circuit and filtering, the data processing module of storage；Telecommunication waterborne with disposal under water machine is realized by optical fiber transmission module；On the basis of hardware system, a set of software for being used to gathering and analyzing submarine pipeline environment of electric field electric potential signal has been write based on LABVIEW development environments, the functions such as collection and storage, shape filtering, spectrum analysis and the damaged hot spot alarm of signal can be realized.
Description
Technical field
The present invention relates to corrosion testing device outside a kind of submarine pipeline.The present invention also relates to rotten outside a kind of submarine pipeline
Lose detection method.
Background technology
Transportation small investment that the pipeline transportation of petroleum gas has, the spy such as the haul-cycle time is short, freight volume is big, efficiency is high
Point is allowed to be referred to as " energy blood vessels ", has obviously advantage in five big transportatioies industry, and expanding economy is risen emphatically
The effect wanted.However, security incident frequently occurs caused by submarine pipeline breakage, ecological environment is not only broken up, to its people
Economy causes loss difficult to the appraisal, while also endangers the life security of the people.Therefore, various circles of society transport to submarine pipeline
The degree of concern more and more higher of row safety problem.
At present, the outer Corrosion monitoring of submerged pipeline will be adopted based on diver's range estimation or the instrument detection of carrying underwater camera
The video or image information collected is shown by precision instrument, and the corrosion shape on surface is judged by image processing techniques
Condition, this not only proposes very high requirement to diver, and can not realize the real-time detection to pipeline.It is also limited by sea simultaneously
The conditions such as condition, the depth of water, season limit.The shortage of the outer Corrosion monitoring means of submarine pipeline, which has become, influences submarine pipeline transport
Technology barrier.
The content of the invention
It is an object of the invention to provide it is a kind of not by sea situation, the depth of water, season limit submarine pipeline outside Corrosion monitoring fill
Put.The present invention also aims to provide corrosion detecting method outside a kind of submarine pipeline.
The outer corrosion testing device of the submarine pipeline of the present invention includes being sequentially connected the pressure difference collection sensor connect, data acquisition
Processing module, signal transmission device and remote observation control terminal, pressure difference collection sensor, digital sampling and processing and the letter
Number transmitter is located under seawater, and the remote observation control terminal is located on seawater, passes through optical fiber transmission signal between each several part；
The pressure difference collection sensor uses platinum electrode；The digital sampling and processing uses NI degrees of data capture cards, and in number
According to differential amplifier circuit is added before collection, voltage signal is amplified in capture card acquisition range.
Corrosion detecting method is outside the submarine pipeline of the present invention：
Step 1：Platinum electrode tested pipeline surface move, when run into corrosion it is local when, platinum electrode produce pressure difference signal；
Step 2：Pressure difference signal is delivered to difference amplifier caused by platinum electrode, and pressure difference signal is amplified into capture card can
With the voltage signal between the 0-5V of collection；
Step 3：Signal after differential amplification is acquired with capture card, and is transferred to remote observation control terminal, is adopted
Sample set of frequency is 1KHZ；
Step 4：The system based on libview receives the signal that capture card gathers and shown in remote observation control terminal
And be transferred to medium filtering module and be filtered and extract useful signal from noise signal, then spectrum analysis is carried out, analyze
The time domain and frequency domain character of signal, foundation is provided for the judgement of hot spot.
In order to solve the technical barrier of Corrosion monitoring outside submarine pipeline, the present invention proposes one kind with non-touching measurement principles
With device of the virtual instrument technique for the sea-bottom oil-gas conveyance conduit external anti-corrosion layer breakage corrosion detection system of theoretical foundation and inspection
Survey method, so as to the normal operation of service conduit；By to the submarine pipeline surface current density distribution under cathodic protection and week
The analysis of collarette border Electric Field Distribution feature, voltage difference method is applied to the broken of the transportation pipe pipeline external anticorrosive coating under marine environment
In damage detection, and complete the design of system hardware and software section.
(1) hardware aspect realizes the high speed acquisition to signal using data collecting card as core devices, have chosen suitable electricity
Chemical signal measuring probe, devise signal amplification circuit and filtering, the data processing module of storage；Waterborne and disposal under water machine
Telecommunication realized by optical fiber transmission module；According to being actually needed for working environment, the independently-powered module that has been system configuration.
(2) on the basis of hardware system, write based on LABVIEW development environments a set of for gathering and analyzing seabed
The software of pipeline environment electric field potential signal, the collection and storage, shape filtering, spectrum analysis and damaged corrosion of signal can be realized
The functions such as point alarm.
Brief description of the drawings
Fig. 1：Submarine pipeline corrosion testing device theory diagram.
Fig. 2：Submarine pipeline corrosion testing device structural representation.
Fig. 3：System software entire block diagram.
Fig. 4：Real-time Survey Software workflow diagram.
Fig. 5：Fiber transceiver system structure.
Embodiment
Illustrate below in conjunction with the accompanying drawings for a more detailed description to the present invention.
With reference to Fig. 1 and Fig. 2, the outer corrosion testing device of submarine pipeline of the invention mainly includes pressure difference collection sensor 1, number
According to acquisition processing module 2, signal transmission device 3, remote observation control terminal 4 and pipeline 5.Wherein described pressure difference collection sensing
Device, digital sampling and processing, signal transmission device are located under seawater, and remote observation control terminal is located on seawater, and signal
Transmitted by optical fiber.
Pressure difference collection sensor uses platinum electrode.Platinum electrode has good stability；Anti- polarization performance is strong；Temperature-responsive
The good electrode temperature coefficient of characteristic is also smaller, low to the sensitivity of temperature, be influenced by temperature just it is smaller, and when temperature return
To after original temperature, electrode potential should have corresponding change, and no hysteresis quality, performance is relatively stable, and platinum electrode
Service life is longer than common reference electrode.
Data acquisition module adds differential amplification using NI high-accuracy data collection cards before data acquisition
Circuit, voltage signal is amplified in capture card acquisition range.
The data transmission link of the system is transmitted using optical fiber.Optical transport mode is hardly influenceed by electrical interference.For
The environmental changes such as temperature change, it can also keep stable.Even under the conditions of the such harsh environment in ocean, can also it is expected to obtain
Satisfied stability.
The remote observation control terminal of the system using the host computer made based on libview.Pass through data first
Control instruction, configuration parameter can be sent in hardware device by acquisition module, real-time Survey Software, and receive hardware device hair
The data of software are delivered to, data source is provided for the analyzing and processing of next step；Data processing is the core of whole Survey Software in real time,
Filtering and spectrum analysis including signal.The effect of filtering is that signal is screened, and useful signal is extracted from noise signal
Out, the effect for composing analysis is the time domain and frequency domain character of signal Analysis, and foundation is provided for the judgement of hot spot；Data processing knot
Fruit is more vivid, is intuitively presented on screen, using waveform and the display mode of data.
The information of the collection of the system is saved in local disk in real time.
With reference to Fig. 3-Fig. 5, the outer corrosion detecting method of submarine pipeline of the invention includes following workflow step：
Step 1：Moved first with platinum electrode in pipe surface, faint pressure difference letter will be produced when running into corrosion place
Number.
Step 2：Pressure difference signal caused by platinum electrode is delivered to ad620 composition difference amplifiers and amplifies signal.It is amplified to
Voltage signal between the 0-5V that capture card can gather.
Step 3：Signal after differential amplification is acquired with capture card, and is transferred to host computer, sample frequency is set
For 1KHZ.
Step 4：The signal that master system based on libview receives capture card collection shows and is transferred to intermediate value
Filtration module is filtered, and filtering parameter can be set.There is boolean's indicator lamp in host computer interface, if lamp is bright, just
Illustrate the position pipeline back of the body corrosion.
One：The data acquisition of data acquisition module, by data acquisition module, real-time Survey Software can refer to control
Make, configuration parameter is sent in hardware device, and is received hardware device and is sent to the data of software, be the analyzing and processing of next step
Data source is provided.
Two：The transmission of signal, the system are carried out the transmission of signal by optical fiber, underwater signal are transferred into waterborne, light
The structure chart of fine transceiver is as shown in Figure 5.
Three：Data Analysis Services, it is the core of whole Survey Software in real time, includes the filtering and spectrum analysis of signal.Filter
The effect of ripple is that signal is screened, and useful signal is extracted from noise signal, and the effect for composing analysis is analysis letter
Number time domain and frequency domain character, provide foundation for the judgement of hot spot.
Four：As a result display and storage, data processed result is more vivid, is intuitively presented on screen to make, using ripple
The display mode of shape and data.Oscillogram is shown the front and rear time domain waveform of signal filtering and after Fast Fourier Transform (FFT)
Frequency-domain waveform, by calling Waveform Graph.vi to realize.Signal voltage corresponding to sampled point is shown in data
Value, is realized with Real Matrix.vi, and the electrical potential information collected in real time is saved in disk in a text form,
Follow-up research is facilitated to handle.
Claims (2)
1. a kind of outer corrosion testing device of submarine pipeline, it is characterized in that：Including being sequentially connected the pressure difference connect collection sensor, data
Acquisition processing module, signal transmission device and remote observation control terminal, the pressure difference collection sensor, digital sampling and processing
It is located at signal transmission device under seawater, the remote observation control terminal is located on seawater, is transmitted between each several part by optical fiber
Signal；The pressure difference collection sensor uses platinum electrode；The digital sampling and processing uses NI degrees of data capture cards, and
Differential amplifier circuit is added before data acquisition, voltage signal is amplified in capture card acquisition range.
2. the monitoring method of corrosion testing device outside a kind of submarine pipeline based on claim 1, it is characterized in that：
Step 1：Platinum electrode tested pipeline surface move, when run into corrosion it is local when, platinum electrode produce pressure difference signal；
Step 2：Pressure difference signal is delivered to difference amplifier caused by platinum electrode, and pressure difference signal is amplified into capture card to adopt
Voltage signal between the 0-5V of collection；
Step 3：Signal after differential amplification is acquired with capture card, and is transferred to remote observation control terminal, sampling frequency
Rate is arranged to 1KHZ；
Step 4：The system based on libview receives the signal that capture card gathers and shows and pass in remote observation control terminal
Defeated be filtered to medium filtering module by useful signal extracts from noise signal, then carries out spectrum analysis, signal Analysis
Time domain and frequency domain character, provide foundation for the judgement of hot spot.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710726009.4A CN107677717A (en) | 2017-08-22 | 2017-08-22 | A kind of outer corrosion testing device of submarine pipeline and detection method |
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| CN201710726009.4A CN107677717A (en) | 2017-08-22 | 2017-08-22 | A kind of outer corrosion testing device of submarine pipeline and detection method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109615845A (en) * | 2018-12-24 | 2019-04-12 | 中国船舶重工集团公司第七〇九研究所 | A kind of acoustic-electric magnetic is integrated to be detected and communication integral cable battle array |
| CN113945583A (en) * | 2021-12-20 | 2022-01-18 | 武汉武桥检测工程有限公司 | Underwater detection device for offshore wind farm |
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| CN102132162A (en) * | 2008-07-02 | 2011-07-20 | 倍加福公司 | Electrochemical noise as a localized corrosion indicator |
| CN102507430A (en) * | 2011-11-11 | 2012-06-20 | 天津亿利科能源科技发展股份有限公司 | Online monitoring device for corrosion in pipeline |
| CN104374802A (en) * | 2013-08-15 | 2015-02-25 | 中国石油天然气集团公司 | Submarine pipeline detection apparatus and detection method thereof |
| CN103439532A (en) * | 2013-09-02 | 2013-12-11 | 厦门乐钢材料科技有限公司 | Microelectrode technology for metal surface microcell current distribution in-situ detection |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109615845A (en) * | 2018-12-24 | 2019-04-12 | 中国船舶重工集团公司第七〇九研究所 | A kind of acoustic-electric magnetic is integrated to be detected and communication integral cable battle array |
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| CN113945583A (en) * | 2021-12-20 | 2022-01-18 | 武汉武桥检测工程有限公司 | Underwater detection device for offshore wind farm |
| CN113945583B (en) * | 2021-12-20 | 2022-02-18 | 武汉武桥检测工程有限公司 | Underwater detection device for offshore wind farm |
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Application publication date: 20180209 |